The Art and Science of Designing High-End Audio Cables John E. Johnson, Jr.December 4, 2025 Designing high-end audio cables combines art andscience, requiring a thorough knowledge of electrical engineering, materials, and acoustics. TechnicalTechnical Reviews
From Silent Shadows to Singing Screens: How Hollywood First Brought Sound to the Movies – JJ’s Blogs John E. Johnson, Jr.November 26, 2025 For the first three decades in the 20th century, cinema was an art of images without voices. Silent films spoke through gesture,... Blogs & Little ThingsJJ's BlogsTechnical Article
Understanding the Measurement of Noise When Looking at an FFT-Produced Spectrum David A. Rich, Ph.D.November 13, 2025 This article provides an overview of the information shown in the spectrum plots in Secrets reviews of components with DACs. Among these... TechnicalTechnical Reviews
Intermodulation in Audio Signals John E. Johnson, Jr.November 6, 2025 Intermodulation (IM) in audio refers to the unwanted interaction between different frequencies in a signal, creating additional... PrimersTechnical
Why Tube Power Amplifiers Require Output Transformers and Why Their Design is Critical John E. Johnson, Jr.September 25, 2025 Vacuum tube amplifiers are beloved for their sonic qualities, but unlike transistor-based designs, they cannot drive loudspeakers... PrimersTechnical
How a Sine Wave is Calculated, Frequency Peaks Visualized, and Harmonic Distortion Measured Using Calculus and FFT Analysis John E. Johnson, Jr.September 4, 2025 Several Hi-Fi magazines use spectral analyzers to illustrate test signal peaks with their harmonic peaks for audio equipment. Did you ever... PrimersTechnical
Development of Modern Anamorphic (Widescreen) Lenses from the Original “Cinemascope” Lenses of the 1950s John E. Johnson, Jr.August 14, 2025 The development of anamorphic lenses marked a pivotal moment in the evolution of cinematic storytelling, significantly enhancing the... TechnicalTechnical Reviews
How Does a Cathode Follower in a Tube Audio Circuit Work? John E. Johnson, Jr.July 24, 2025 A cathode follower is a vacuum tube circuit commonly used in audio applications for impedance matching, buffering, and signal conditioning. TechnicalTechnical Reviews
Printed Circuit Boards (PCBs): How They Are Manufactured John E. Johnson, Jr.July 3, 2025 The manufacturing of Printed Circuit Boards (PCBs) involves multiple steps, combining chemical, mechanical, and automated processes to... PrimersTechnical
Dual Triode Vacuum Tubes 12AX7 and 12AU7 – Why They Are So Popular for Use in Audio Amplifiers John E. Johnson, Jr.June 12, 2025 The 12AX7 and 12AU7 tubes serve different roles in an amplifier due to their distinct electrical characteristics. They are dual triode tubes... TechnicalTechnical Reviews
The Differences Between ®Dolby Atmos and ®DTS: X John E. Johnson, Jr.May 29, 2025 ®Dolby Atmos and ®DTS:X are both object-based spatial audio formats, but they differ in terms of their mathematical processing, encoding... PrimersTechnical
The Concept of Radiation Resistance and Speaker Driver Diameter – Why Woofers Have to be Large John E. Johnson, Jr.May 15, 2025 In loudspeaker design, radiation resistance plays a crucial role in determining how efficiently a speaker converts electrical energy into... PrimersTechnicalTechnical Article
The Application of Fast Fourier Transform (FFT) to Digital Audio Files John E. Johnson, Jr.May 8, 2025 The Fast Fourier Transform (FFT) is applied to digital audio files in various scenarios, especially when analyzing or processing audio data. PrimersTechnical
The Mathematics of How Analog-to-Digital Converters (ADC) and Digital-to-Analog Converters (DAC) for PCM Digital Music Recordings Do Their Job John E. Johnson, Jr.April 17, 2025 An Analog-to-Digital Converter (ADC) transforms an analog signal, which is continuous in time and amplitude, into a digital signal, which is... TechnicalTechnical ArticleTechnical Reviews
Analog Tape Recording and Playback Technology: The Principles, Practical Applications, and a Comparison to Digital Audio Recording John E. Johnson, Jr.April 10, 2025 Analog tape recording and playback involve several mathematical principles and concepts, spanning from physics to signal processing. Analog TapeTape DecksTechnicalTechnical ArticleTechnical Reviews
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